package com.shopping.service.Impl;

import com.google.common.base.Splitter;
import com.google.common.collect.Lists;
import com.shopping.common.Const;
import com.shopping.common.ResponseCode;
import com.shopping.common.ServerResponse;
import com.shopping.dao.CartMapper;
import com.shopping.dao.ProductMapper;
import com.shopping.pojo.Cart;
import com.shopping.pojo.Product;
import com.shopping.service.ICartService;
import com.shopping.util.BigDecimalUtil;
import com.shopping.util.PropertiesUtil;
import com.shopping.vo.CartProductVo;
import com.shopping.vo.CartVo;
import org.apache.commons.collections.CollectionUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.List;

@Service("iCartService")
public class CartServiceImp implements ICartService {
    @Autowired
    private CartMapper cartMapper;
    @Autowired
    private ProductMapper productMapper;

    public ServerResponse<CartVo> add(Integer userId, Integer productId, Integer count) {

        if (productId == null || count == null) {
            return ServerResponse.createByErrorCodeMessage(ResponseCode.ILLEGAL_ARGUMENT.getCode(), ResponseCode.ILLEGAL_ARGUMENT.getDesc());
        }
        Cart cart = cartMapper.selectCartByUserIdProductId(userId,productId);
        if (cart == null) {
            //这个产品不在这个购物车里，需要新增一个这个产品的记录
            Cart cartItem = new Cart();
            //count数量
            cartItem.setQuantity(count);
            cartItem.setChecked(Const.Cart.CHECKED);
            cartItem.setProductId(productId);
            cartItem.setUserId(userId);
            cartMapper.insert(cartItem);

        } else {
            //则产品已经存在购物车里了
            //如果产品已经存在，则相加
            count = cart.getQuantity() + count;
            cart.setQuantity(count);
            //更新购物车商品数量
            cartMapper.updateByPrimaryKeySelective(cart);
        }
        return this.list(userId);
    }
public ServerResponse<CartVo> list(Integer userId){
        CartVo cartVo=this.getCartVoLimit(userId);
        return ServerResponse.createBySuccess(cartVo);
}
public ServerResponse<CartVo> update (Integer userId, Integer productId, Integer count){
    if (productId == null || count == null) {
        return ServerResponse.createByErrorCodeMessage(ResponseCode.ILLEGAL_ARGUMENT.getCode(), ResponseCode.ILLEGAL_ARGUMENT.getDesc());
    }
    Cart cart = cartMapper.selectCartByUserIdProductId(userId, productId);
    if (cart != null){
        cart.setQuantity(count);
    }
     cartMapper.updateByPrimaryKeySelective(cart);
    return this.list(userId);
    }
    public ServerResponse<CartVo> selectOrUnSelect(Integer userId,Integer productId,Integer checked){
        cartMapper.checkedOrUncheckedProduct(userId,productId,checked);
        return this.list(userId);
    }

public ServerResponse<CartVo> deleteProduct(Integer userId,String productIds){
    List<String> productList = Splitter.on(",").splitToList(productIds);
    if (CollectionUtils.isEmpty(productList)){
        return ServerResponse.createByErrorCodeMessage(ResponseCode.ILLEGAL_ARGUMENT.getCode(), ResponseCode.ILLEGAL_ARGUMENT.getDesc());
    }

    cartMapper.deleteByUserIdProductIds(userId,productList);
    return this.list(userId);
}
public ServerResponse<Integer> getCartProductCount(Integer userId){
    if (userId ==null){
        return ServerResponse.createBySuccess(0);
    }
        return ServerResponse.createBySuccess(cartMapper.getCartProductCount(userId));
}




    private CartVo getCartVoLimit(Integer userId) {
        CartVo cartVo = new CartVo();
        List<Cart> cartList = cartMapper.selectCartByUserId(userId);
        List<CartProductVo> cartProductVoList = Lists.newArrayList();

        BigDecimal cartTotalPrice = new BigDecimal("0");
        if (CollectionUtils.isNotEmpty(cartList)) {
            for (Cart cartItem : cartList) {
                CartProductVo cartProductVo = new CartProductVo();
                cartProductVo.setId(cartItem.getId());
                cartProductVo.setUserId(cartItem.getUserId());
                cartProductVo.setProductId(cartItem.getProductId());

                Product product = productMapper.selectByPrimaryKey(cartItem.getProductId());
                if (product != null) {
                    cartProductVo.setProductMainImage(product.getMainImage());
                    cartProductVo.setProductName(product.getName());
                    cartProductVo.setProductSubtitle(product.getSubtitle());
                    cartProductVo.setProductStatus(product.getStatus());
                    cartProductVo.setProductStock(product.getStock());
                    // 判断库存
                    int buyLimitCount = 0;
                    if (product.getStock() >= cartItem.getQuantity()) {
                        buyLimitCount = cartItem.getQuantity();
                        cartProductVo.setLimitQuantity(Const.Cart.LIMIT_NUM_SUCCESS);
                    } else {
                        buyLimitCount = product.getStock();
                        cartProductVo.setLimitQuantity(Const.Cart.LIMIT_NUM_FAIL);
                        // 购物车中更新有效库存
                        Cart cartForQuantity = new Cart();
                        cartForQuantity.setId(cartItem.getId());
                        cartForQuantity.setQuantity(buyLimitCount);
                        cartMapper.updateByPrimaryKeySelective(cartForQuantity);
                    }
                    cartProductVo.setQuantity(buyLimitCount);
                    // 计算总价
                    cartProductVo.setProductTotalPrice(BigDecimalUtil.mul(product.getPrice().doubleValue(),
                            cartProductVo.getQuantity()));
                    cartProductVo.setProductChecked(cartItem.getChecked());
                }

                if (cartItem.getChecked() == Const.Cart.CHECKED) {
                    cartTotalPrice = BigDecimalUtil.add(cartTotalPrice.doubleValue(),
                            cartProductVo.getProductTotalPrice().doubleValue());
                }
                cartProductVoList.add(cartProductVo);
            }
        }
        cartVo.setCartTotalPrice(cartTotalPrice);
        cartVo.setCartProductVoList(cartProductVoList);
        cartVo.setAllChecked(this.getAllCheckedStatus(userId));
        cartVo.setImageHost(PropertiesUtil.getProperty("ftp.server.http.prefix"));
        return cartVo;
    }
    private boolean getAllCheckedStatus(Integer userId) {
        if (userId == null) {
            return false;
        }
        return cartMapper.selectCartProductCheckedStatusByUserId(userId) == 0 ? true : false;
    }
    //全选
    //全反选

    //单独选
    //单独反选

    //查询当前用户购物车里面的产品数量，如果一个产品有十个，那么数量就是十

}
